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Another interesting idea:
Take some Prius battery modules and make a series of parallel (2X7.2V) 14.4V packs. Would possibly need a custom charger (beyond me) and a custom clamp system. (Simple job for me).
Don't know how they would stand up to repeated deep cycles.
If I'm not mistaken a Gen1 pack, rewired, would yield 19 - 14.4V blocks @ 6.5ah = 123.5 Ah. If you could get one cheap, that is.
My lead acids are 120Ah each for $49 a piece and I already have chargers.
Lead acid: 30-40 Wh/kg
Prius NiMH: 46 Wh/kg
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